#[non_exhaustive]pub enum TtmlStylePassthrough {
Disabled,
Enabled,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against TtmlStylePassthrough
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let ttmlstylepassthrough = unimplemented!();
match ttmlstylepassthrough {
TtmlStylePassthrough::Disabled => { /* ... */ },
TtmlStylePassthrough::Enabled => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when ttmlstylepassthrough
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant TtmlStylePassthrough::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
TtmlStylePassthrough::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant TtmlStylePassthrough::NewFeature
is defined.
Specifically, when ttmlstylepassthrough
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on TtmlStylePassthrough::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms. Pass through style and position information from a TTML-like input source (TTML, IMSC, SMPTE-TT) to the TTML output.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Disabled
Enabled
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl TtmlStylePassthrough
impl TtmlStylePassthrough
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for TtmlStylePassthrough
impl AsRef<str> for TtmlStylePassthrough
source§impl Clone for TtmlStylePassthrough
impl Clone for TtmlStylePassthrough
source§fn clone(&self) -> TtmlStylePassthrough
fn clone(&self) -> TtmlStylePassthrough
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for TtmlStylePassthrough
impl Debug for TtmlStylePassthrough
source§impl Display for TtmlStylePassthrough
impl Display for TtmlStylePassthrough
source§impl From<&str> for TtmlStylePassthrough
impl From<&str> for TtmlStylePassthrough
source§impl FromStr for TtmlStylePassthrough
impl FromStr for TtmlStylePassthrough
source§impl Hash for TtmlStylePassthrough
impl Hash for TtmlStylePassthrough
source§impl Ord for TtmlStylePassthrough
impl Ord for TtmlStylePassthrough
source§fn cmp(&self, other: &TtmlStylePassthrough) -> Ordering
fn cmp(&self, other: &TtmlStylePassthrough) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for TtmlStylePassthrough
impl PartialEq for TtmlStylePassthrough
source§fn eq(&self, other: &TtmlStylePassthrough) -> bool
fn eq(&self, other: &TtmlStylePassthrough) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for TtmlStylePassthrough
impl PartialOrd for TtmlStylePassthrough
source§fn partial_cmp(&self, other: &TtmlStylePassthrough) -> Option<Ordering>
fn partial_cmp(&self, other: &TtmlStylePassthrough) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for TtmlStylePassthrough
impl StructuralPartialEq for TtmlStylePassthrough
Auto Trait Implementations§
impl Freeze for TtmlStylePassthrough
impl RefUnwindSafe for TtmlStylePassthrough
impl Send for TtmlStylePassthrough
impl Sync for TtmlStylePassthrough
impl Unpin for TtmlStylePassthrough
impl UnwindSafe for TtmlStylePassthrough
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more